body {
  margin: 0;
  padding: 0;
  font: 14px "Lucida Grande", Helvetica, Arial, sans-serif;
}
a {
  color: #00B7FF;
  text-decoration: none;
}
.center{
  position: relative;
  left: 50%;
  width: 40%;
  text-align: center;
  margin-left: -20%;
}
.sigin-main{
  margin: 0;
  background: url(/img/1.jpg) center center;
  min-width: 1200px;
  height: 600px;
}
.sigin-content{
  position: absolute;
  top: 100px;
  right: 50px;
  width: 300px;
  height: 300px;
  background-color: #fff;
  padding: 20px 30px;
}
.padding-bottom{
  padding-bottom: 10px;
}
.head-nav{
  position: relative;
  top: 0;
  height: 60px;
  line-height: 60px;
  background-color: #0993dc;
}
.head-nav .nav-left{
  position: absolute;
  left: 40px;
  color: #fff;
  font-size: 16px;
}
.head-nav .nav-left a{
  color: #fff;
  text-decoration: none;
  margin-right: 10px;
}
.head-nav .nav-right{
  position: absolute;
  right: 40px;
}
.head-nav .nav-right a{
  color: #fff;
  font-size: 16px;
  margin-right: 10px;
  text-decoration: none;
}
.nav-right .admin{
  position: absolute;
  top: 0;
  left: -120px;
}

